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Engine Specific Info and Questions => IDI Engine => Topic started by: Barry W on January 30, 2007, 10:34:25 pm

Title: Diverter valve on a diesel?
Post by: Barry W on January 30, 2007, 10:34:25 pm

I have a '91 1.6TD, i'm about to rebuild the motor and i'm new to VW diesel's but not to VW's.

Question is: Do turbo diesels use a diverter valve or blow off valve?

Title: Diverter valve on a diesel?
Post by: jtanguay on January 30, 2007, 10:49:03 pm

the 1.6TD has a 'safety' blow off valve that opens at around 12-13 psi.

you don't really need it... just get a boost gauge and regulate with your foot... thats what i do :)

Title: Diverter valve on a diesel?
Post by: QuickTD on January 31, 2007, 06:54:32 am

A blow off or diverter valve is used to relieve the pressure behind the throttle plate when the throttle plate suddenly closes. This prevents the turbo from "surging" due to lack of airflow. Diesels do not have a throttle plate and continue to flow lots of air on overrun so a blow off valve is of no use.